{"uid":"cap_AiFLG13NDX1QMRSQ-FlUu","slug":"rotary-agency-crossref-lookup-c96b0e6f","name":"Rotary Agency CrossRef Lookup","description":"Free-source data APIs (100% margin, no proxy, $0.002/call): ...","url":"https://rotaryagency.uk/api/free/crossref?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":null,"responseSchema":{"type":"json","example":{"varies":"endpoint-specific structured JSON"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"down","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_WrvEhL9PAFhzxDEfVa23y","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Proxies the CrossRef API to retrieve scholarly metadata for publications, journals, and DOIs via a paid-per-call endpoint","exampleAgentPrompt":"Can you look up the CrossRef metadata for the DOI 10.1038/nature12345 and tell me the title, authors, publication date, and journal?","exampleUseCases":[{"title":"Resolving DOI to full citation","prompt":"I have this DOI — 10.1016/j.cell.2020.02.058 — can you pull the full bibliographic details from CrossRef, including title, authors, journal, and publication date?"},{"title":"Finding papers by an author","prompt":"Search CrossRef for recent publications by the author 'Jane Smith' affiliated with MIT and give me a list of their papers with DOIs and publication years."},{"title":"Verifying journal metadata by ISSN","prompt":"Can you look up the journal with ISSN 1476-4687 on CrossRef and tell me its full name, publisher, and any other metadata available?"}],"resultDescription":"Returns a structured JSON object from CrossRef containing bibliographic metadata such as DOI, title, authors, journal name, ISSN, publisher, publication date, abstract, citation count, and related identifiers, formatted as CrossRef's standard work record.","failureModes":["DOI not found in CrossRef registry returns empty or error response","Malformed DOI input causes query failure","CrossRef rate limits or downtime propagate as errors","Ambiguous title queries return multiple or irrelevant results","Payment failure at $0.002/call blocks request before reaching CrossRef"],"whenToPreferThis":"Use this endpoint when you need programmatic, per-call access to CrossRef bibliographic metadata — especially when the underlying CrossRef API is unavailable or you want a simple monetized proxy with x402 payment support. Prefer this over direct CrossRef access when operating in an agentic payment-enabled environment that already handles x402 micropayments.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-25T06:26:39.837Z","isFirstParty":false,"canonicalSlug":"rotary-agency-crossref-lookup-c96b0e6f"}